161311164503 has 2 divisors, whose sum is σ = 161311164504. Its totient is φ = 161311164502.

The previous prime is 161311164461. The next prime is 161311164551. The reversal of 161311164503 is 305461113161.

It is a weak prime.

It is an emirp because it is prime and its reverse (305461113161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161311164503 - 2⁶ = 161311164439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161311164503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161311164563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80655582251 + 80655582252.

It is an arithmetic number, because the mean of its divisors is an integer number (80655582252).

Almost surely, 2^161311164503 is an apocalyptic number.

161311164503 is a deficient number, since it is larger than the sum of its proper divisors (1).

161311164503 is an equidigital number, since it uses as much as digits as its factorization.

161311164503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

Adding to 161311164503 its reverse (305461113161), we get a palindrome (466772277664).

The spelling of 161311164503 in words is "one hundred sixty-one billion, three hundred eleven million, one hundred sixty-four thousand, five hundred three".